33. a stupid person that he can't understand the lesson
35. The First World War broke out in 1918
36. me of having spoiled his party
37. While he was studying law, he met a future wife
41. you helped your mother with the housework
42. children went to bed
43. 3 hours to fly from Ho Chi Minh City to Singapore
46. who helped you with the work yesterday has just been met by me
49. been a considerable increase in the sales of mobile phone since 2005
50. it difficult to connect the new dishwasher
51. as he is, he can't reach the top of the ceiling
52. the bad weather, the match was postponed to the following Sunday
53. Philip was too tired to carry on walking